Hey do you tie the dimmer wires together +/- from BOTH meanwell drivers and tie them to the pairs to the Rapid led dimmer wires, correct? I don't need 2 dimmers, do I ?
Yes, connect everything in parallel, + to + and - to -.
One Rapid dimmer should operate both. It's a good idea to keep a spare on hand whether it's a Rapid dimmer or a pot. You get what you pay for with cheap no name pots on ebay, I wouldn't bother with a spare for a name brand like Bourns. They also have ten turn pots for precision control.
I bought one from a Chinese ebay seller once, won't do that again.
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Linear ±20 %.
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Meanwell drivers use a 100k pot and its a good idea to add a 10k resistor in series as there's a large tolerance on pots and anything under 100k wont give full power.
To control more than one driver, divide those those resistance numbers by the number of drivers..... 50k pot and 5k resistor for 2 drivers.
A larger resistor is no big deal, it just won't dim down as far. Who needs to run a grow light at 10% anyway?